/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package java.io;

import java.util.Objects;

/**
 * Wraps an {@link IOException} with an unchecked exception.
 *
 * @since 1.8
 */
public class UncheckedIOException extends RuntimeException {

  private static final long serialVersionUID = -8134305061645241065L;

  /**
   * Constructs an instance of this class.
   *
   * @param message the detail message, can be null
   * @param cause the {@code IOException}
   * @throws NullPointerException if the cause is {@code null}
   */
  public UncheckedIOException(String message, IOException cause) {
    super(message, Objects.requireNonNull(cause));
  }

  /**
   * Constructs an instance of this class.
   *
   * @param cause the {@code IOException}
   * @throws NullPointerException if the cause is {@code null}
   */
  public UncheckedIOException(IOException cause) {
    super(Objects.requireNonNull(cause));
  }

  /**
   * Returns the cause of this exception.
   *
   * @return the {@code IOException} which is the cause of this exception.
   */
  @Override
  public IOException getCause() {
    return (IOException) super.getCause();
  }

  /**
   * Called to read the object from a stream.
   *
   * @throws InvalidObjectException if the object is invalid or has a cause that is not an {@code
   * IOException}
   */
  private void readObject(ObjectInputStream s)
      throws IOException, ClassNotFoundException {
    s.defaultReadObject();
    Throwable cause = super.getCause();
    if (!(cause instanceof IOException)) {
      throw new InvalidObjectException("Cause must be an IOException");
    }
  }
}
